<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <button id="btn">Add</button>

    <script>
      // F12 -> 性能 -> ctrl+E
      const arrList = [];
      function test() {
        for (let i = 0; i < 100000; i++) {
          document.body.appendChild(document.createElement("p"));
        }
        arrList.list(new Array(10000000).join("x"));
      }

      document.getElementById("btn").addEventListener("click", test);
    </script>
  </body>
</html>
